Patrick and Nadine comment on the pathologist's report, while Mathis, Camille and Mélanie take turns to go through the lie detector . The polygraph examiner concludes that none of them are lying at first glance, but Da-Xia provides valuable additional information collected on their use of the Internet. Isabelle learns that Mr. Beauvais's wife is in the hospital after consuming rat poison. Patrick and Nadine take stock with Sonia to establish a strategy that would make it possible to lay charges relating to the death of little Lily. In the evening, Nadine receives Bruno Gagné who sets his conditions for coming to work on Théo's investigation.